db-save.html

<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/firebase-element/firebase-element.html">

<polymer-element name="db-save">
	<template>
		<firebase-element 	id="db" 
							location="http://cth-storage.firebaseio.com/" 
							data="{{data}}" 
							keys="{{keys}}"
							childEvents
							log>
		</firebase-element>
	</template>
	<script>
		Polymer('db-save', {
			publish: {
				combinedvote: {}
			},
			didThing: 0,
			combinedvoteChanged: function(){
				if (!this.didThing) {
					var user = this.combinedvote.userId;
					this.data[user] = this.combinedvote;
					this.$.db.commit();
					this.didThing = 1;
				}
			}
		});
	</script>
</polymer-element>